(02 Jun 2024, 9:18 am)DaveFromUpNorth wrote Sorry what's a class2
1 = Express passenger service (or postal)
2 = Local passenger service
3 = Originally used for Freight trains capable of more than 75mph but now used for some test trains and some empty passenger trains which have time or route critical paths.
4 = Freight - limited to 75mph
5 = Empty passenger coaching stock (ECS)
6 = Freight - limited to 60mph
7 = Freight - limited to 45mph - occasionally used for track machines and departmental
8 = Freight - limited to 35mph or less - occasionally used for track machines and departmental
9 = Originally only Eurostar trains but also now expanded to include certain other workings requiring a specific routing (e.g. West Coast Main Line trains via Birmingham and London Overground trains via East London Line)
An example 1Sxx, will normally mean an express passenger train terminating in Scotland followed by an ID like 01, 02 etc